TonyF IANAL, but what little I know about eviction tells me that it’s never an easy option. I was really glad to see a couple of lawyers posting (and I hope you understood them better than I did…). From what I’ve seen, your requests have been resonable. (My last rent agreement was similar, but we had an auction for the big room.) Having had my share of horrible roommates, I say get rid of her, hurt feelings on her cousins part or no. I think this will be like pulling off a band-aid: you either get it over with or it will be really long and drawn out and may hurt feelings worse in the end. I’ve noticed that the cousin doesn’t want to get involved. Does that mean that he does not want to deal with her either? What are you going to do if she does up and leave? Will the four of you split the bill? Do you have another friend to bring in? If either of the cases, I would seriously consider giving her one more chance at the negotiations, then make things clear: if she does not agree with the rest of the renters she should start looking for a new place. I disagree with Peter Morris. He may have a soft-spot for underdogs like I do, but one person who has agreed to nothing with a group of people has no reason to expect them to bow to her wishes. I would ask Peter if it is fair for her to pay 100$ a month because her cousin gave her a favorable sublease when rent for the unit is $2000 a month. Just because the cousin (who now takes no part in the discussion) promised one thing, that is no reason for you to honor it.
-JAGeek